-an, -ian, -eanLatinadjective- and noun-forming suffix
that means in adjectives: from (a place) or pertaining to or following (a figure or school of thought); in nouns: person or thing from (a place) or associated with (an activity or school of thought).

More about this word part:

The suffix group -an
, -ian
, -ean
attaches to common nouns and proper nouns to form adjectives or nouns.